歌曲《时间都去哪儿了》中唱到：“时间都去哪儿了？还没好好感受年轻就老了，生儿养女一辈子，满脑子都是孩子哭了笑了……”这朴实无华的歌词，将父母之爱表达得震撼人心。作为子女，我们应该（    ）

①体会父母为抚养我们付出的辛劳              ②继承和弘扬中华民族孝亲敬长的传统美德

③亲近父母，理解体谅父母的一片苦心      ④调适逆反心理，听从父母的一切教诲

    Most people graduate from school and then get a job. Everyone wants a job that pays well. How much money can you make? Ask yourself these questions: What can I do? What skills do I have? Also ask yourself: How much education do I have? For most jobs, the higher your education, the higher your earning power.
    In the United States, high school graduates make about $18,600 a year. If you do not finish high school, you make only $10,800 a year. You can make $7,800 more each year by staying in high school!
    If you stay in school, then you can make more money. A person with a high school degree makes about $18,600 a year. If that person goes to college and gets a bachelor’s degree (学士学位), he can make $42,000. With a master's degree (硕士学位), he can make about $53,000. If the person gets a PhD (博士学位), he can make almost $79,000 or more a year.
    We can learn a very important thing from this information. If you want to work and make more money, get a good education.

用下列物质的序号填空：a．武德合金　b．干冰　c．氢气   d．维生素　e．双氧水

（1）可用作清洁能源的是____ ；

（2）可用于人工降雨的是____ ；

（3）可用作保险丝的是____ ；

（4）可用于实验室制氧气的是____ ．